    14      12      25 **(Nee, Nnd, Nsd)**
     0       0      1      2      -1      2      1      2      1      0
     1       0      3      1      -1      0      3      5      0      3
     2       0      2      4       6      4      0      8      4      1
     3       0      5      3       7      1      5      9      3      6
     4       6      0      4       2      8      5      4     11      7
     5       6      5      0       3      4     10      6      7     12
     6       4      2      7      -1      9      2     10     14      8
     7       5      8      3      -1      3     11     13      9     16
     8       4      9      6      12      4      9     17     11     15
     9       4      7      9      -1      8      6     19     15     14
    10       6     10      5      11      5     13     18     12     20
    11       5     10      8      -1      7     10     22     16     18
    12       6      9     11      -1     13      8     23     21     17
    13       6     11     10      -1     10     12     24     20     21
---------------------------------------------------
   e:   i,   j,   k,   ei,  ej,  ek, si, sj, sk